Hmm, let's tick off my cousins.
Mum's side (let's ignore that most of the aunts/uncles are NC with each other):
Male cousin, 1 year older. Don't know where he lives. Grew up 300 miles away. Sort of perved on me at my grandad's funeral 
Female cousin, 1 year younger. Lives in Islamabad. Lovely girl, came on one holiday with us 18 years ago, but no, we don't speak.
Male cousin, ? years younger - 3? Location - unknown.
Female cousin - 15, I think? Born abroad when I was 14. Have met her three times.
Dad's side:
40 something male: Married with 3 or 4 kids. Not sure. Dad is one of six, and they were older, so we didn't see lots of them when we were young. Have him on facebook and seems like a nice bloke. Didn't invite to his wedding.
2nd brother of same family. Also married with 3/4 kids. Ditto the above, but no real relationship with him even by facebook.
My fiance:
Two cousins only on his mum's side. None from his dad or stepdad. We see them 3-4 times a year socially. One girlfriend, no kids between them.
We're inviting the latter two to the day and the two cousins on my dad's side to the evening, and that's it. Do people really, honestly, think the genetic relationship I have with these people is more important than the forty odd friends who I see regularly, who laugh, and support, and share my life?
I am constantly surprised, but so proud, that out of the mess of my family life, riddled with toxic behaviour and NC, I have so many wonderful friends to celebrate with.